Sighting instrument.



PATENT-5D JUNE 2s, i908. A

A KONG SIGHTING INSTRUMENT. APPLICATION FILED OCT. 4,1907. N

`40 besidesa scale of full circuit at 55 means ofthe vertical pi vot bo.

UNITED` STATES naar entire.

or CARL zEiss, or JENA,

GERMANY.

`sIGHTING INSTRUMENT.

Specification of Letters Patent.

lamented June 23, 1908.

Application led October 4,; 1907. Serial No. 395,909.

To all whom '5t may concern:

f Be it known that I, ALBERT KNIG, a citizen of the German Empire, and residing' at `Carl-Zeiss strasse, Jena, 1n the Grand Duchy 5 ofl Saxe-Weimar, Germany, have invented a new and useful Sighting Instrument, of which.

the following is a speciiication.

The invention relates to sighting instruments on stands, tripods o'r the like and particularly to such of these instruments, as have the carrier of rotatable-by Worm gearing in thevertical sighting plane and are provided with a scale at the Worm to measure small angles above and below the horizontal, t'. e., the angles of elevation or depression of the sighted.

The object of the invention is to simpl' these instruments, so Athat appl'ance's for rendering the bearing of the` saidcarrier or the head of the stand, on Wbicli'this bearing rests, horizontal in the sighting planeare .dispensed With. This object is attaine by arranging a tubular spirit level on the carrier or on the instrument itself parallel to the sighting line and making either the scale arrangedl at the Worm or its index independently rotatable about the axis of the Worm.

Instead of levelingffthe bearing of the carrier in the sighting plane, the instrument is rendered available for measuring the angle of elevation or depression by bringing the level first of all into play throughrotation of the worm and thereupon rotating the scale or the index until the horizontaI mark on the4 scale is indicated. e new arrangement is still advantageously applicable, when, for the purpose of increasing the` angle whichl an be measured, the Worm a ,second scale co-axial With the Worm Wheel, 1s employed, the intervals of which correspolnd leach to the fullv circuit of the first sca e.

In the annexed-drawing: Figure 1 is a side elevation of a sighting instrument constructed according to the invention. f Fig. 2 is a vertical section along the line' 2-2 of Fig. 1, Fig. 3 is a side elevation of another instrument. Fig. 4 vis a vertical section alongthe line4--4 of Fig.'3..

In the example shown in Figs. l and 2 there is only oi e scale. -In the head a, of the stand the forked beari g b is iotatable by the instrument proper .objects the index In this bear-l ing the carrier c1 of the sighting telescope c With its screw attached axle c is accom- 1 modated. The prongs of the forked bearing have on one side two arms b1 and b2, in which the shaft d of the worm dois supported. A lateral enlargement c2 of the carrier c1 is developed as a Worm Wheel sector. The Worm shaft d carries at one end the milled head d1 and at the other end facin the index t3 a knob with scale d2. This knolg) is loosely Aheld on its shaft d by the washer d3. The tubular spirit level c3 is fixed' on the axle c of the Vcarrier parallel to the line of sight of the telescope c. The relative adjustment of the parts of the instrument as represented (withhorizontal line of sight) is accomplished by bringing the level into play andthereupon rotating the scale d2 about its 'shaft d until the-index b3 points to the horizontal mark. The ap roximate vertical position of the plane oi) rotation of the carrier c1 can be obtained by suitably altering;l the set up of the stand judging by the eye, if, as represented on account of sim licity, the bearing t be unprov'ided with a tubular spirit level parallel to the axis of the bearing.

The second example, Figs. 3 and 4, makes use of a simple bearing body e, which is in this case also rotatable in the stand head a, about a vertical pivot e. Differing from the vfirst example, the carrier ff of the telesco ef is forkedand directly carries the levelp f1, While the axle el is screwed en to the bearing c. The worm Wheel sector e2 is a part of the bearing c, consequently non-rotatable, and the shaft g of the Worm go is supported in the arms f2 and f3 of the carrier bf 0, it turns consequently with this carrier a out the axle e1. The milled head g1 and the rotatable scale g2 are adapted as the corresponding parts in the first example, the scale being under the yielding pressure oi the Washer g3 land facing the index f4. To the scale f5, 0n the carrier f 0 an index t corresponds which is adapted to rotate on the pivot e1 and Whose pin h". presents a handle for adjustment purposes. The position of. the parts represented isA again that of being ready for taking measurements and is broughtA about by bringing-the level into play and adjusting the scale g2 and 7L until the horizontal marks are pointed to. Each telescope is to be considered a sighting telescope, in Which a line of sight is determined by" a mark in the image field. As

y .,.coinbinatioin with the carrier of the instrug ment proper, oiga Worm gearing adaptedito such mark a conspicuous point on the marg-in or rotate the carrier in the vertical sighting of the diaphragm of' the iield oiy View instance, the lowest or the highest point) xplane, a circular scale co-axial to the Worm, 2o may suffice for the present purpose. an index for this scale, an arc scale coaxial I claim: to the worm Wheel, an index for this second 1. In a stand siglitirip,y g instrument the scale and a tubular spirit level carried by combination, with the carrier of the instruthe carrier parallel to the line ot sight, the ment proper, of a worm gearing; adapted to circular sca e and its index being adjustable 25 rotate the carrier in the vertical sighting plane, a

circular scale oo-axial to the worin, an index for this scale and a tubular spirit level carried by the carrier parallel to the 1 relatively to each other and inde endently line oi' sight, the scale and theindex being l of the Worm movement, and the divisions of v the arc scale corres ending each to a full circle of thefirst sca e.

ALBERT KNIG.

adjustable relatively to each other and 1ndependen'tly of the worm movement.

2 Witnesses: 2. In a stand sighting instrument the PAUL KRGER, .FRITZ SANDER. 

